ZooKeeper实践二：集群安装
系统环境（本次环境）准备三台Linux服务器，系统要求如下：
Linux: CentOS 6.5 64bit Server
Java: 1.7.0_60 64-Bit Server VM
ZooKeeper 使用Java语言编写，运行环境需要Java环境支持，建议使用JDK1.6以上版本。Java环境请自行配置。给三台服务器各自配置IP。
下载ZooKeeper
在每一个服务器上下载ZooKeeper，本次使用的版本：zookeeper-3.4.5.tar.gz
将安装文件解压至某一目录：/usr/zookeeper-3.4.5
#tar zxvf zookeeper-3.4.5.tar.gz
配置ZooKeeper
1）三台服务器分别创建数据目录
Server1: #mkdir /var/zookeeperdata
Server2: #mkdir /var/zookeeperdata
Server3: #mkdir /var/zookeeperdata
2)分别在在数据目录中创建myid文件，并添加id值
Server1: #echo "1" > /var/zookeeperdata/myid
Server2: #echo "2" > /var/zookeeperdata/myid
Server3: #echo "3" > /var/zookeeperdata/myid
3)分别修改配置文件
Server1: #cd /usr/zookeeper-3.4.5/conf
Server1: #cp zoo_sample.cfgzoo.cfg
Server1: #vi zoo.cfg
tickTime=2000
initLinmit=10
syncLimit=5
dataDir=/var/zookeeperdata
clientPort=2181
server.1=server1 IP:2888:3888
server.2=server2 IP:2888:3888
server.3=server3 IP:2888:3888
Server2: #cd /usr/zookeeper-3.4.5/conf
Server2: #cp zoo_sample.cfgzoo.cfg
Server2: #vi zoo.cfg
tickTime=2000
initLinmit=10
syncLimit=5
dataDir=/var/zookeeperdata
clientPort=2181
server.1=server1 IP:2888:3888
server.2=server2 IP:2888:3888
server.3=server3 IP:2888:3888
Server3: #cd /usr/zookeeper-3.4.5/conf
Server3: #cp zoo_sample.cfgzoo.cfg
Server3: #vi zoo.cfg
tickTime=2000
initLinmit=10
syncLimit=5
dataDir=/var/zookeeperdata
clientPort=2181
server.1=server1 IP:2888:3888
server.2=server2 IP:2888:3888
server.3=server3 IP:2888:3888
增加集群实例到配置文件中，server.X中”X”表示每个数据目录中的myid的值
4)分别设置ZooKeeper环境变量（可选操作，方便操作，推荐配置）
#vi /etc/profile
export ZOOKEEPER_HOME=/usr/zookeeper-3.4.5
export PATH=$PATH:$ZOOKEEPER_HOME/bin:$ZOOKEEPER_HOME/conf
分别启动ZooKeeper
Server1: #zkServer.sh start
Server2: #zkServer.sh start
Server3: #zkServer.sh start
查看运行状态
Server1: #zkServer.sh status
JMX enabled by default
Using config: /usr/zookeeper-3.4.5/bin/../conf/zoo.cfg
Mode: leader
Server2: #zkServer.sh status
JMX enabled by default
Using config: /usr/zookeeper-3.4.5/bin/../conf/zoo.cfg
Mode: follower
Server3: #zkServer.sh status
JMX enabled by default
Using config: /usr/zookeeper-3.4.5/bin/../conf/zoo.cfg
Mode: follower
我们看到有一台Server为leader，其余为follower。
查看ZooKeeper物理文件目录结构
Server1: #tree –L 3 /var/zookeeperdata
/var/zookeeperdata
├── myid
├── version-2
│ ├── acceptedEpoch
│ ├── currentEpoch
│ └── snapshot.0
└── zookeeper_server.pid
Server2: #tree –L 3 /var/zookeeperdata
/var/zookeeperdata
├── myid
├── version-2
│ ├── acceptedEpoch
│ ├── currentEpoch
│ └── snapshot.0
└── zookeeper_server.pid
Server3: #tree –L 3 /var/zookeeperdata
/var/zookeeperdata
├── myid
├── version-2
│ ├── acceptedEpoch
│ ├── currentEpoch
│ └── snapshot.0
└── zookeeper_server.pid
停止ZooKeeper
Server1: #zkServer.sh stop
JMX enabled by default
Using config: /usr/zookeeper-3.4.5/bin/../conf/zoo.cfg
Stooping zookeeper … STOPPED
Server2: #zkServer.sh stop
JMX enabled by default
Using config: /usr/zookeeper-3.4.5/bin/../conf/zoo.cfg
Stooping zookeeper … STOPPED
Server3: #zkServer.sh stop
JMX enabled by default
Using config: /usr/zookeeper-3.4.5/bin/../conf/zoo.cfg
Stooping zookeeper … STOPPED
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